Night of the Sentinels: Part 1 - S1-E1
Character mistake: When Jubilee wakes up in the infirmary, the sphygmomanometer on her wrist has been applied over her gloved hand, which could cause a false reading. Beast is the X-Men's resident doctor, so presumably he's the one that applied it to her, so he should have known to remove her gloves first for more accurate readings. (00:08:24)